I remember from the Landmark Forum I attended, that language was discussed as that which forms our personalities when we learn to describe ourselves as we learn to use language.
I found this article today and thought it was very interesting in that context.
Here’s a link: http://blog.ted.com/2013/02/19/5-examples-of-how-the-languages-we-speak-can-affect-the-way-we-think/
enjoy!